Wireless Communication Short Questions and Answers

Questions

41 Global Positioning System uses

A CDMA

B TDMA

C SDMA

D FDMA

View Answer

Answer: CDMA

42 The guard interval is provided in OFDM

A To eliminate the need of pulse shaping filter

B To eliminate ISI

C High symbol rate

D Both a and b

View Answer

Answer: Both a and b

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43 Packet radio refers to

A Multiple users on single channel

B Single user on multiple channels as per demand

C Multiple users on multiple channels at different time slots

D All of the above

View Answer

Answer: Multiple users on single channel

44 Disadvantages of packet radio are

A Induced delays

B Low spectral efficiency

C Large spectrum required

D Both a and b

View Answer

Answer: Both a and b

45 Pure ALOHA is a

A Hybrid access protocol

B Demand access protocol

C Scheduled access protocol

D Random access protocol

View Answer

Answer: Random access protocol

46 The increase in number of users in PURE ALOHA causes

A Increase in delay

B Increase in probability of collision

C Increase in spectrum

D Both a and b

View Answer

Answer: Both a and b

47 SDMA technique employs

A Smart antenna technology

B Use of spatial locations of mobile units within the cell

C More battery consumption

D Both a and b are correct

View Answer

Answer: Both a and b are correct

48 The increased capacity of SDMA is due to

A Focused signal transmitted into narrow transmission beams

B Smart antennas pointing towards mobile stations

C Use of different frequencies at same time slot

D Both a and b are correct

View Answer

Answer: Both a and b are correct

49 ———– introduced Frequency Modulation for mobile communication systems in 1935.

A Edwin Armstrong

B Albert Einstein

C Galileo Galilei

D David Bohm

View Answer

Answer: Edwin Armstrong

50 Paging systems were based on

A Simplex systems

B Half duplex systems

C Full duplex systems

D None of the above

View Answer

Answer: Simplex systems

51 2G CDMA standard – cdma one supports up to

A 8 users

B 64 users

C 32 users

D 116 users

View Answer

Answer: 64 users

52 3G W-CDMA is also known as

A UMTS

B DECT

C DCS-1800

D ETACS

View Answer

Answer: UMTS

53 The minimum spectrum allocation required for W-CDMA is

A 5MHz

B 2MHz

C 500KHz

D 100KHz

View Answer

Answer: 5MHz

54 Spectrum Efficiency of a cellular network is

A The traffic carried by whole network

B The traffic carried per cell divided by the bandwidth of the system and the area of a cell

C Expressed in Erlang /MHz /km2

D Both b and c

View Answer

Answer: Both b and c

55 In Handoff

A Process of transferring the call to the new base station

B Transfers the call

C New channel allocation is done

D All of the above

View Answer

Answer: All of the above

56 Inter system Handoffs are done

A When mobile station moves in two cellular systems with different MSC

B When mobile station moves between two cellular systems

C When mobile station receives more power from other base station than the serving base station

D All of the above

View Answer

Answer: All of the above

57 Dwell time is the time for

A A call within the cell

B Hand off

C Waiting for channel allocation

D None of the above

View Answer

Answer: A call within the cell

58 Dwell time depends upon

A Interference

B Distance between the subscriber and the base station

C Propagation of call

D All of the above

View Answer

Answer: All of the above

59 GSM is an example of

A TDMA cellular systems

B FDMA cellular systems

C CDMA cellular systems

D All of the above

View Answer

Answer: TDMA cellular systems

60 In Mobile Assisted Handoff (MAHO), the handoff takes place when

A The power received by the mobile station from other base station is more than the serving base station

B The channel allocated is not available

C The mobile station has no signal

D All of the above

View Answer

Answer: The power received by the mobile station from other base station is more than the serving base station

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